Stock Appearing Race Saws

[Mr.]

Okay Mr Fred.If I put something on any number of forums stating how to do some thing I usually show how it is done.I don't "google " it,I do it.By the same token if I do not know how,I don't state I do.

BTW I googled nothing. I was into auto racing before I ever thought of chainsaws and the rest seems obvious.

If you have a REAL question, just ask it.

Fred

 

[Al Smith]

I answered the PM Fred,read it.

Everybody ,most likely has different way of doing things and a different mind set about certain things.

That said,and it has been said the the cranksaft is really the heart of the engine.Now I've had motorcycle cranks welded and re-turned to stock,no problems at all.These however were stock Indian cranks,long before most on this site were born.To weld a set of wheels,similar to a Harley set up would take much more experiance and specialised machinery than I have at my disposal.Most likely about nobody but maybe a half dozen on all the forums combined could do this,I'm not one.

So,with that mouth full said,who in the name of heaven could ever do this in a garage? I mean a set of Harley wheels with a tapered crank pin is a beech to align.A set of dead in pressed fit wheels would be a real challange.This is not simple to do.

 

[drmiller100]

.A set of dead in pressed fit wheels would be a real challange.This is not simple to do.

sure it is. build a simple jig, get it aligned, press it together, and use a BIG frigging hammer to fine tune.

there are a LOT of people that mess with 2 stroke crankshafts.

it ain't magic.

 

[Mr.]

One thing that would make it easier to adjust, is to decrease the diameter of the outtermost parts of the centerpin slightly. This way you would only need a smaller BFH to adjust.

Most would weld the crank after reassembly for a little added insurance anyways, so this would not affect the integrity at all.

Fred

 

[manual]

I answered the PM Fred,read it.

Everybody ,most likely has different way of doing things and a different mind set about certain things.

That said,and it has been said the the cranksaft is really the heart of the engine.Now I've had motorcycle cranks welded and re-turned to stock,no problems at all.These however were stock Indian cranks,long before most on this site were born.To weld a set of wheels,similar to a Harley set up would take much more experiance and specialised machinery than I have at my disposal.Most likely about nobody but maybe a half dozen on all the forums combined could do this,I'm not one.

So,with that mouth full said,who in the name of heaven could ever do this in a garage? I mean a set of Harley wheels with a tapered crank pin is a beech to align.A set of dead in pressed fit wheels would be a real challange.This is not simple to do.

I've done Harley cranks before.
First one was a 72 XLCH, I made my own jig. Ha... Assembled the cases together and the counter balancers hit the cases.
Back to the drawing board and succes.
Rode that bike to S.D. and back to Cal.
Of corse that was a tapered fit.

So Fred you want to take a stright fit and align it. yea it can be done.
What do you have in mind and how much you willing to spend ?

 

[Mr.]

So Fred you want to take a stright fit and align it. yea it can be done.
What do you have in mind and how much you willing to spend ?

Budget: nothing.

I think a 272, stock appearing, stroked 2mm would probably run better than a 181, but the advantage would be so small.

Fred

 

[manual]

well it would be a torque monster,
Ok So were thinking out of the box.
@ 2mm most likely you would have to make new counter balancers.
also a stronger piston rod.
Now what cylinder would you be using?

 

[Mr.]

well it would be a torque monster,
Ok So were thinking out of the box.
@ 2mm most likely you would have to make new counter balancers.
also a stronger piston rod.
Now what cylinder would you be using?

Rod is more than stong enough. Balance??????

Use the 272 or the 281. You'll be cutting the head off anyway.

Fred

 

[drmiller100]

One thing that would make it easier to adjust, is to decrease the diameter of the outtermost parts of the centerpin slightly. This way you would only need a smaller BFH to adjust.

one might think that, but a BFH is the CORRECT way to true a crank. a smaller bfh is the incorrect way to do it.

also, you can take a TRUE crank, weld it, and until you know what you are doing for a 2 cylinder at least, end up with .003 inches runout.

which is acceptable.

there for sure is a trick to welding cranks.

 

[Al Smith]

Again,I've never seen a Husky crank.On a Harley one way is to chuck it between two centers in a big sturdy lathe and use 4 dial indicaters,wedges,clamps and a big heavy lead hammer.I forget the amount of allowable run out but 'taint much.Bear in mind though that dealing with a Harley you are only talking maybe 6,000 rpms instead of at least twice that much on a hotsaw engine.

 

[Al Smith]

Only a theory

Some thought on the matter.In my way of thinking,right or wrong,it would appear to me that an off-set pin would be an easier solution than welding up the holes in the wheels and recutting to any degree of accuracy.

An off set pin is not that hard to make,the alignment could prove to be a challange though.You would have to be right on the gnats ear ,so to speak.It's certainly not a job for the shadetree mechanic nor could it be done in an hour or two.

One theory,although I doubt I ever do it,is to cut an oversized pin,harden it,then press together and tack weld one side.Chuck the whole mess in a crankgrinder and grind the off set desired.Un press it,fit the rod and repress.Might work might not.

You could also off set a pair of center holes in the pin and grind it down with a toolpost grinder but then again you have the problem of alignment.It would take a center in one end of a 4 jaw chuck than had been off set and a tail stock with the ability to be off set .Lawdy that alone would take two hours to dial in,at least for me.Again no way is this easy by any stretch of the imagination.No doubt a guy would end up with a lot of "paper weights" before the desired outcome had been reached.

 

[drmiller100]

like you said, in theory it is all easy.

so, ambient air pressure is 15 psi more or less.

if a feller could figure out how to run at 17 psi, wouldntn that make more difference then the offset crank pin????

might be easier to do as well.

 

[24d]

Lets not start put'n the bolt in the stinger until mr gets one of those several guys he knows to weld up and redrill the hole in the crank shaft to make a stroker racesaw in their "home shop"

 

[drmiller100]

Lets not start put'n the bolt in the stinger until mr gets one of those several guys he knows to weld up and redrill the hole in the crank shaft to make a stroker racesaw in their "home shop"

i don't care who you are, that be some dang funny stuff!!!!!!!

 

[Al Smith]

if a feller could figure out how to run at 17 psi, wouldntn that make more difference then the offset crank pin????

might be easier to do as well.

Sure,if you could ever figure out how to supercharge a 2 cycle engine.The closest attempt was a Mac Bp-1.

The idea has been kicked around for years but nobody has actualy been able to figure it out how other that a tuned pipe.

I think you could do it by using a reed and an injecter but it's all just theoretical,I've never tried it,just talked it up.

Somebody on one of the forums actually got an injecter to work but I haven't heard much about it for several months.The problem that I see with it is lack of crankcase related components lubrication.

 

[Mr.]

Here is a picture of a 101 crank that was welded on by ole Horstman.

Not easy, not impossible.

Fred

 

[drmiller100]

i don't care who you are, that be some dang funny stuff!!!!!!!

sometimes what a write doesn't come across later.
the man took a friendly dig at what I wrote. I took his dig as humor, and laughed myself out of the chair.
I didn't mean it to be an attack or anything mean, but laughing at myself......

 

[drmiller100]

Sure,if you could ever figure out how to supercharge a 2 cycle engine.The closest attempt was a Mac Bp-1.

The idea has been kicked around for years but nobody has actualy been able to figure it out how other that a tuned pipe.

.

i'll start another thread.

 

[24d]

Here is a picture of a 101 crank that was welded on by ole Horstman.

Not easy, not impossible.

Fred

horstman run'n a bead on a crank is a lil diff than several guys weld'n up the entire hole then redrill'n it in their "at home" shop-if in fact horstman even did that crank-
do you know what you are say'n to be a fact or just copy that off the add on e-bay where they have that poj for sell - do you know who's it is??? Im bet'n its never won a contest anywhere and the whole add is bs.

 

[Mr.]

This engine belonged to Kurt Hiser. If you don't know who he is, then you might keep your mouth shut about it.

Are you talking about this weld?

Here's a chain since you have been so interested.

WTH are you anyways?

Fred